\begin{table}[htbp!] \centering \begin{threeparttable}                                 \caption{Average nudge treatment effects}                                  \begin{tabular} {l c c} \toprule                                  & Nudge Units* & Updated BIT-NA \\ & (1) & (2) \\
\hline
Average treatment effect&       1.390&       1.906\\
            &     (0.304)&     (0.587)\\
\hline
Nudges      &         241&         116\\
Trials      &         126&          73\\
Observations&  23,556,095&   1,800,382\\
Average control group take-up (\%)&       17.33&       15.07\\
\textit{Distribution of treatment effects}&            &            \\
\hspace{1em}25th percentile&        0.06&        0.01\\
\hspace{1em}50th percentile&        0.50&        0.40\\
\hspace{1em}75th percentile&        1.40&        1.72\\
\bottomrule \end{tabular} \label{averageeffect}                                 \begin{tablenotes} \footnotesize                                 \item This table shows the average treatment effect of nudges. Standard errors clustered by trial are shown in parentheses.                                         pp. refers to percentage point.                                 \item *Column 1 replicates Column 2 of Table III in DellaVigna and Linos (2022).                                 \end{tablenotes} \end{threeparttable} \end{table}
